Malicious PDF — malware analysis report

Static analysis result for SHA-256 364c84db34d924b8…

MALICIOUS

PDF

42.5 KB
MD5: de3699c470755beb99346b916781ff0b SHA-1: 180814fc11b49b439b4349b458e73ef010f1c8e6 SHA-256: 364c84db34d924b8738ee80565506b435891799917d2e792a021c0e9b86b30cd
188 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution - Malicious File

The PDF was flagged by multiple critical heuristics, including ClamAV detection (Pdf.Exploit.Agent-36830) and an ML classifier indicating a high probability of maliciousness. An embedded script payload was identified, and an embedded file artifact was extracted. The presence of XFA forms and embedded content suggests an exploit attempt, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
fa746bc5c18d30c2198287da7c2b2370b0b7a3c5ba877478836051f42b98f670		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42716 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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